<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-10-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001981546</issuerCik>
        <issuerName>Commercial Bancgroup, Inc.</issuerName>
        <issuerTradingSymbol>CBK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001040521</rptOwnerCik>
            <rptOwnerName>SHOFFNER JAMES J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O COMMERCIAL BANCGROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>6710 CUMBERLAND GAP PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>HARROGATE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37752</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit List:
Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Philip J. Metheny, attorney-in-fact</signatureName>
        <signatureDate>2025-10-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
